JPH0924425A - Simplified drawing die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simplified drawing die able to prevent generation of wrinkles and that able to reduce die cost remarkably. SOLUTION: At the simplified drawing die 10, a pair of advanced block 22 wherein bottom end part 22A is projected to downward than surface 18A of upper die body 18, is fixed. Bottom end part 22A of those advanced block 22 is abutted to a sheet-like blank 16 in advance of surface 18A of upper die body when the upper die body 18 is approached to lower die punch 12 and further the sheet-like blank 16 is inserted into gap formed between the side face 12B of lower die punch 12 and these advanced block 22. Thereby, since the sheet-like blank 16 is fixed in the state received tension, generation of wrinkles is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple drawing die used for drawing a plate material.

[0002]

2. Description of the Related Art In sheet metal working, for example, when a bottomed tubular molded product is manufactured, a drawing process using a drawing die is generally performed.

Such a drawing die is provided with an upper die body (moving die) and a lower die punch (fixed die) which are arranged to face each other, and a blank (a plate-shaped material before processing) is placed on the lower die punch. When the press machine is operated in the state where is placed, the upper mold body moves in the direction of approaching the lower mold punch by the driving force, and the blank is pressed with a predetermined drawing load. With this, the blank is formed into a predetermined shape.

By the way, such a drawing die is usually provided with a blank holder. This blank holder is, for example, arranged laterally of the lower die punch so as to be movable in the direction of the upper die body. Further, a mechanical cushion pin is arranged below the blank holder (that is, on the side opposite to the upper mold body). The mechanical cushion pin is always biased toward the upper mold body by a biasing means such as a spring or a pneumatic cushion. With this mechanical cushion pin, the blank holder is always urged toward the upper die body, and when the upper die body and the lower die punch are separated, the surface of the blank holder on the upper die body side is the engraved surface of the lower die punch. Is machined into a predetermined shape).

In the drawing die having the above structure, when drawing is performed, the blank is sandwiched between the surface of the blank holder and the general surface of the upper die body (the surface around the engraved surface), and the blank is pressed with a predetermined pressing force. "Tension" on the blank by pressing
The wrinkles that occur on the blank.
To prevent

[0006]

However, in the drawing die having the above structure, the blank holder, the mechanical cushion pin, and the urging means for urging them are provided, which increases the manufacturing cost of the die. There are drawbacks.

In view of the above facts, an object of the present invention is to obtain a simple drawing die which can prevent the generation of "wrinkles" and reduce the die cost.

[0008]

According to a first aspect of the present invention, there is provided a simple drawing die which is integrally fixed to a fixed surface plate and whose surface opposite to the fixed surface plate is engraved. It is integrally fixed to the movable platen, and the surface opposite to the movable platen is engraved corresponding to the surface of the fixed mold, and the direction of the fixed mold is moved along with the movement of the movable platen. And a movable die that moves toward and away from the movable die, and is a simple drawing die that forms a plate-shaped material disposed between the fixed die and the movable die by moving the movable die, The movable die is arranged laterally of the movable die in a state of protruding from the surface of the movable die toward the fixed die, and moves toward and away from the movable die in the direction of the fixed die while approaching the fixed die. In the direction of a predetermined stroke, the plate-shaped element is placed between the fixed mold and the side surface of the fixed mold. The preceding blocks forming a possible gap sandwiched provided, is characterized in that.

In the simple diaphragm type having the above structure, the preceding block that moves integrally with the movable type is arranged on the side of the movable type. Here, since the tip portion of the preceding block is projected from the surface of the movable die toward the fixed die, the movable die and the preceding block are arranged with the plate-shaped material disposed between the fixed die and the movable die. Is moved by a predetermined stroke in the direction approaching the fixed die, the tip of the preceding block comes into contact with the surface of the plate-shaped material before the surface of the movable die comes into contact with the surface of the plate-shaped material. Further, when the movable die and the leading block are moved toward the fixed die in this state, the plate-shaped material is sandwiched in the gap formed between the side surface of the fixed die and the leading block. As a result, the plate-shaped material is fixed in a state of being “tensioned”, and the occurrence of “wrinkles” is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a sectional view of a simple diaphragm die 10 according to an embodiment of the present invention.

As shown in this figure, a simple diaphragm die 10
Has a lower die punch 12 as a fixed die. The lower die punch 12 is fixed to a fixed surface plate 14 of a press molding machine by a bolt (not shown). Further, the surface 12A of the lower die punch 12 opposite to the fixed surface plate 14 is given a predetermined engraving, and when the plate-shaped material 16 (blank) is processed, the lower die punch 12 has a The plate-shaped material 16 is set on the surface 12A.

Above the lower die punch 12 (in the direction opposite to the arrow A in FIG. 1), an upper die body 18 as a movable die is arranged so as to face the lower die punch 12. This upper mold body 18
Is fixed to a movable surface plate 20 of the press molding machine, and a surface 18A opposite to the fixed surface plate 14 is engraved with a predetermined shape corresponding to the surface 12A of the lower die punch 12. ing. Further, the upper mold body 18 is connected via a movable platen 20 to a drive mechanism (not shown) of a press molding machine composed of gears and the like, and by receiving the driving force of the drive mechanism, the upper mold body 18 Moves toward and away from the lower die punch 12 (the direction of arrow A in FIG. 1 and the opposite direction).

A pair of preceding blocks 22 are arranged on the side of the upper mold body 18 so as to face each other with the upper mold body 18 interposed therebetween.

A side surface 22B of each preceding block 22 facing the upper mold body 18 is formed corresponding to a side surface 18B of the upper mold body 18, and these preceding blocks 22 are
Each side surface 22B is fixed to the upper mold body 18 with a bolt (not shown) in a state of being in close contact with the side surface 18B of the upper mold body 18. As a result, the preceding block 22 moves together with the upper mold body 18.

The heights of the preceding blocks 22 (that is, the lengths in the direction of arrow A in FIG. 1) are set equal to each other, and the preceding blocks 22 are higher than the upper die body 18. It is set. That is, in the state where the leading block 22 is fixed to the upper die body 18, the lower end portions 22A of the leading block 22 are respectively attached to the upper die body 18
Of the lower die punch 12 protruding downward from the surface 18A of the upper die body 1 with the plate-like material 16 set on the surface 12A of the lower die punch 12.
When 8 moves in the direction approaching the lower die punch 12 (the direction of arrow A in FIG. 1), the lower end portion 22A of the preceding block 22 moves before the surface 18A of the upper die body 18 contacts the plate material 16. This is a configuration in which it contacts the plate-shaped material 16.

Further, these leading blocks 22 are located on the side surface 12B of the lower die punch 12 when the upper die body 18 is moved by a predetermined stroke in the direction of approaching the lower die punch 12.
And the side surface 22B of the preceding block 22 between the plate-shaped material 16
This is a configuration for forming a gap corresponding to the plate thickness.

Next, the operation of this embodiment will be described through a drawing process using the simple drawing die 10 having the above structure.

In the drawing process using the simple drawing die 10 having the above structure, first, with the upper die body 18 and the preceding block 22 being separated from the lower die punch 12 by a predetermined distance, a plate is formed on the surface 12A of the lower die punch 12. The strip-shaped material 16 is arranged.

Next, when the drive mechanism of the press molding machine operates in this state, the upper die body 18 and the leading block 22 are moved in a direction approaching the lower die punch 12. here,
Since the lower end 22A of the leading block 22 projects below the surface 18A of the upper die body 18, when the upper die body 18 and the leading block 22 move in the direction of approaching the lower die punch 12, the upper die body 18 The lower end 22A of the preceding block 22 is brought into contact with the plate-shaped material 16 before the surface 18A. In this state, the upper mold body 18 and the preceding block 22 are further
When the plate-like material 16 is moved, the plate-like material 16 is pressed downward by the preceding blocks 22, and the plate-like material 16 is placed in the gap between the side surface 22B of each preceding block 22 and the side surface 12B of the lower die punch 12. It gets caught. As a result, the plate-shaped material 16 is fixed in a state where "tension" is given (state shown in FIG. 2).

Further, when the upper mold body 18 and the leading block 22 are moved in this state, the surface 18 of the upper mold body 18 is moved.
The plate-shaped material 16 is brought into contact with A to start forming the plate-shaped material 16 (state shown in FIG. 3), and in this state, the front and back surfaces of the plate-shaped material 16 are separated from the upper die body 18 and the lower die punch 12, respectively. The plate-shaped material 16 is formed by moving the upper mold body 18 and the preceding block 22 until they are completely adhered to the surfaces 18A, 12A (state shown in FIG. 1).

Here, the plate-shaped material 16 is the preceding block 2
Since the upper mold body 18 and the lower mold punch 12 are fixed in a “tensioned” state, “wrinkles” generated in the plate-shaped material 16 by the movement of the upper mold body 18 are prevented.

As described above, in the simple drawing die 10 having the above structure, the plate-like material 16 is "tensioned" by the leading block 22 and the lower die punch 12 arranged on the side of the upper die body 18. Since it has been configured to prevent the occurrence of "wrinkles" by fixing with, the blank holder, mechanical cushion pin, and the urging means such as springs and cushions for urging them are no longer required, and the die cost is reduced. Can be significantly reduced.

In this embodiment, the preceding block 22 is fixed to the upper mold body 18, but the invention is not limited to this.
For example, the leading block 22 may be fixed to the movable surface plate 20. Even in this case, the same effect as this embodiment can be obtained.

Further, in the present embodiment, the pair of preceding blocks 22 are arranged on the side of the upper mold body 18, but the present invention is not limited to this. For example, the number of the preceding blocks 22 may be increased to increase the upper mold body 18. It may be configured to be appropriately arranged around the.
In this case, not only the same effect as in the present embodiment can be obtained, but also the plate-shaped material 16 can be more securely fixed in a state of being “tensioned”, and the generation of “wrinkles” can be further prevented.

[0025]

As described above, in the simple aperture type according to the present invention, the preceding block is arranged on the side of the movable type,
Since a plate-shaped material is sandwiched between the side surface of the preceding block and the side surface of the fixed mold and the plate-shaped material is fixed with "tension" applied to prevent "wrinkle" from occurring, the conventional diaphragm type As described above, the blank holder, the mechanical cushion pin, and the urging means such as the spring and the cushion for urging them are not required, and the die cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a simple diaphragm die according to an embodiment of the present invention.

FIG. 2 is a sectional view corresponding to FIG. 1, showing a state in which a plate-shaped material is fixed by a simple drawing die according to an embodiment of the present invention.

FIG. 3 is a sectional view corresponding to FIG. 1, showing a state in which molding of the plate-shaped material has started.

[Explanation of symbols]

 10 Simple diaphragm type 12 Lower die punch (fixed type) 14 Fixed surface plate 16 Plate material 18 Upper die body (movable type) 20 Movable surface plate 22 Preceding block

Claims (1)

[Claims] 1. A fixed die which is integrally fixed to a fixed surface plate and whose surface opposite to the fixed surface plate is engraved, and a movable surface plate which is integrally fixed to a movable surface plate. And a movable die which is engraved on the surface opposite to the surface of the fixed die corresponding to the surface of the fixed die, and moves toward and away from the fixed die as the movable surface plate moves. A simple drawing die for molding a plate-shaped material disposed between the fixed die and the movable die by moving the die, wherein a tip portion of the die protrudes from the surface of the movable die toward the fixed die. Is arranged laterally of the movable die in a state, and moves toward and away from the movable die in the direction of the fixed die integrally with the movable die, and in a state of moving for a predetermined stroke in a direction approaching the fixed die, with the side surface of the fixed die. A preceding block that forms a gap in which the plate material can be sandwiched between The simple diaphragm type is characterized in that